Effect of a Disperse Phase on the Ductile Brittle Transition of Body Centered Cubic Metals

Item

Title
Effect of a Disperse Phase on the Ductile Brittle Transition of Body Centered Cubic Metals
Creator
Evans, P. R. V.
Corporate Author
Armour Research Foundation
Contract
AF 33(616)-6506
DoD Project
7024(802)
Index In
Materials Research Abstracts: A Review of the Air Force Materials Research and Development (1962), p. 310
U.S. Government Research Reports, Vol. 38, No. 3, p. S-15
Distribution Classification
2
Report Availability
Not available via Contrails
Abstract
The tensile properties of electron-beam melted columbium and a series of columbium-nitrogen alloys containing up to 0.036w/o nitrogen have been examined at room temperature over a range of grain sizes.  The variation of lower yield stress σLY with grain-size d has been used to determine the values of σ0 + kd-1/2. Whereas k was not influenced by nitrogen content and was, with one exception, immeasurably small, σ0 was particularly sensitive to nitrogen content. Some dispersion-hardened structures (Cb2N as dispersed phase) were studied and, employing the Petch equation, a quantitative measure of the contribution of the dispersion to yield strength was made. A measure of the Peierls-Nabarro force for the columbium lattice at room temperature was obtained.
Date
1962
Extent
34
Corporate Report Number
ARF-2975-6
Report Number
ARL 62-301
Index Price
$3.60
AD Number
AD-275 118
Type
report
Distribution Conflict
Yes